Boiler.



9- DB GRAHL. BOILER.

APPLIUATIOII rum: FEB. 21, nos.

91 5,427. Patented Mar. 16, 1909.

21 Flg. 1.

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SHEETS-SHEET 1.

G. DE GRAHL.

BOILER.

APPLIUATIOH FILED r2121, 100s.

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UNITED STATES T OFFICE.

BOILER.

Application filed February 27, 1908.

To all whom it may concern Be it known that I, GUSTAV on GRAHL, a

sulfeet of the German Em )eror and residin at \Vilmersdorf, near Berlln, Germany, have invented certain new and useful Improvements in Boilers, of which the following is a specification.

The subject-matter of the present invention is a device for temporarily admitting air into the fire-box of a boiler through the firedoor which is formed as a tilting or swing oor.

Devices are already known in which air is temporarily admitted into the fire-boxof a boiler through the fire-door which is formed as a swing door. In those known devices the lire-door is connected with a retarding device, such as a cataract or the like, in such a manner that the door can freely traverse thefirst part of its path, both when opening and. shutting it, without influencing or being III-i fluenced by the retarding mechanism, but then, however, the fire-door does work on the retarding mech anism or remains subjected to its action.

Now an important object of the present invention is to improve the devices above referred to, one improvement being that, when opening or shutting the fire-door, it can be fixed while it freely traverses a part of its path, this being made possible by toothing and a pawl mounted on the shaft of the door.

A further improvement, as compared with the known arrangement mentioned above, 1

consists in the fire-door being able to be influenced in such a manner by an ejector operating on the cataract-piston that the firedoor partially opens notwithstanding the circumstancc that the pawl for iixin the same rests in the corresponding gap in the teeth of the ratchet mechanism.

A third improvement consists in air pipes opening at both sides of the door-frame into the fire-box, through which air passes into the furnace. In this manner, when the fun nace is worked at high pressure, combustion is prevented, which produces carbon monoXid, whereas the air admitted when opening the fire-door serves for burning the smoke.

In order that the invention may be clearly understood, reference is made to the accompanying drawing in which one embodiment 18 re resented by way of example, and in whic Figure 1 is a front elevation of a fire-door and its appertaining controlling mechanism,

Specification of Letters Patent.

Patented March 16, 1909.

Serial No. 418,160.

and Fig. 2 is a vertical section in the plane A-B in Fig. 1. Fig. 3 is a vertical section through the means for transmitting the motion of the cataract to the shaft of the liredoor and vice versa. Figs. 4, 5 and 6 are side elevations partly in section of the subject-matter of the invention in three diiierent positions of the fire-door. Figs. 7 and 8 are views from below of the closing devices looking in the direction of the arrows in Fig. 1.

As is seen in the drawings and particularly in Figs. 1 and 2, the fire-door 1 formed as a tilting or swing door is rigidly connected by screws with the shaft 2. On the latter there is attached the collar 3 provided with the two notches or incisions 4 and 5. Projections 6, 7 of the collar 9 attached on the cataract-shaft 8 engage in the notches 4, 5. The projections 6, 7 do not completely fill up the notches 4, 5 so that the collar 3 can i rotate with regard to the projections 6, 7 until the shoulders 10, 11 (Fig. 4) or the shoulders 12, 13 (Fig. 6) abut against the projections 7, 6 or 6, 7 of the collar 9. The cataract-shaft 8 is journaled in the part 14 of the cataract-cylinder 39 and carries the cataract-lever 15 which operates the cataractpiston 16 when reciprocated, or when the cataract-piston moves upward or downward is reciprocated. On the other end of the shaft 2 there is attached a lever 17 formed as a counterweight and provided with the handle 18. Besides the lever 17 there is attached on the shaft 2 the sector 19 which is provided with toothing 20 like that of a ratchet-wheel. This toothing 20 is bounded l by slanting upwardly extending faces on the side toward the fire-door, so that when 0 ening the door the sector 19 with the toot ing 20 can slide under the tooth 25. On the shoulder 21 of the door-frame there is pivoted at 22 the pawl 23 which is provided with f the handle 24 and which can be lowered i with its tooth 25 into one of the gaps between the teeth 20. The cataract-cylinder 39 is connected above through pipe 40 with an ejector 41. the steam pipe 42; in the latter there is arranged a stop valve 43 for shutting off steam from the e ector. The cataract-piston 16 can be sucked or raised up by the ejector without the lever 17 requiring to be operated by hand. In the door-frame 26 there open laterally the two air pipes 27, 28 which serve for allowing air to pass continuously into the Into the ejector 41 there opens lire-lmx.

with the closing devices 22), ht], and the latter are ahle to l e opened and closed lrv operating the lever Ill 32 in the one or the other direction, and they are protected hv sieves 34,353 from heing soiled.

When opening the lire-door t, that is to sa v as soon as the shalt 2 with the collar 3 is rotated when the lever 17 is depressed, the collar 3 will he ahle at lirst to traverse adistance freely without influencing the collar 9 of the cataract-shaft R nor the piston 16. ()n the contrary. the cataractpiston is only influenced when the lire-door is opened sofar that the shoulders it), ll of the collar 3 hit against the projections T, 6 ol the collar It and act on the cataract-piston by means of the collar .t, as is represented in Fig. 4. \Vhen closing the tire-door, that. is to say when the door is hronght from the position according to Fig. 5 into the position according to Fig. t3, the collar 3 w th its shoulders 10, l 1 is moved away from the projections 7, t) o the collar 9, permitting the door to he closed without the same lacing influenced by the cataract-piston. Only when the tiredoor has arrived in the position according to Fig. (5, namely when the shoulders 12, 13 ot the collar It lie against the projections 6, T ol the collar 0, will the cataract-pistmi he ahlc to act on the tire-door and delay the closing of the same.

B) the sector 19 hcing provided with toothing like that of a ratchet wheel, with which toothing the tooth 25 ot' the pawl 23 can engage. a number of rests are made for the fire-door during its movement from its closed position into the position according to Fig. 4, as well as in its path from its open position into the position according to Fig. 6. Thus during its motion from its closed position into the iosition according to Fig. 4 the tirealmn can lJt optionally adjusted, and likewise also during its movement lroni its open position into the position according to l Fig. 6. in this manner the advantage is obtained that, for example when stolnng the grate with the stoking rod, and also in other cases, the tire-door can he lixcd during its idle movement exactly as is desired.

'When the tire-door rotates into its open position the sector it) slides with its toothing it! under the tooth 25. hen closing the door, namel v when rotating the sector 1.) in the opposite direction, the tooth 25 must he lifted from the toothing ol' the sector it) by means of the handle 34, as shown in Fig. 6, when it is possible to close the door. By the tooth 25 not forming a hindrance to the door rotating into its open position, it is possible for the lire-door to he opened alter the regulator is shut, whether when entering into a station or in other cases in which it is necessary to open the door again in order to prevent smoke being emitted from the locomotive. The fire-door can also he opened without operating the lever IT by raising the piston 16 oi the cataract lrv means of the ahove mentioned ejector. The motion of the piston 16 is then transmitted by lever 15 to the cataract-shal't S and from here by collar l! and the projections 6, 7 onto the collar 3% and the shaft 2.

As already indicated above, air is continuously supplied through the )ipes 27, 28 into the lire-box, whereh}. comlmstion is prevented, which produces carhon. monoxid when the furnace is worked at high pressure.

hat .l claim as my invention and desire to secure hv Letters Patent is I 1. in devices for temporaril admitting air into a fire-box, the combination. of a dooolramc (26), a shaft (2) provided at one end with a. lever (17) mounted revolubly on the door-frame, a tirealoor (ll rigidly attached to said shalt, means for fixing the lire-door during its movement in its open position, a collar (3) having notches (4, 5) and slnjiulders (12, 13) rigidl attached to the end ol said shalt reverse from that carrying said lever, a cataract (Sti t having a piston (no, a shaft (8), means for transmitting the motion of said piston to the latter shaft and vice versa, and a collar (Ell having projections (6. Ti fixed on the latter shaft, said )rojections engaging in the notches (l, 5) ol the former collar l 2. ln devices for temporarily admitting air into a tire-hox, the comhination of a door-frame (2th, a shaft (2) provided at one end with a lever (17 i mounted revolnhlv on the door-frame, a lire-door (ll rigidly at tached to said shalt, a pawl (25) pivoted on said door-frame, a sector (it!) )rovided with toothing (20) mounted on sa d shaft, said pawl heing ada ted to engage in said toothmg ('20), a col ar (Bl having notches (l, at and shoulders (12, 13) rigidlv attached to the end of said shalt reverse from that arrving said lever, a cataract (3!!) having a piston (16), a shaft. (8), means For transmitting the motion of said piston to the latter shaft and vice versa, and a collar (9) having projections (6, T) lined on the latter shalt, said projections engaging in the notches (4, 5) of the former collar (2%).

3. In devices for temporarily admitting air into a lire-hon, the combination oi a doori'raine (2G), a shaft (2) provided at one end with a lever (17) mounted revolnhlv on the door-frame, a lirealoor (l) rigidly attached to said. shalt, a pawl (25) pivoted on said door-frame, a sector (19) provided with toothing (20) mounted on said shaft, said pawl being adapted toengagc in said toothing (2(1), said toothing (20) being bounded on the side facing the door frame hv slanting upwardly extending faces, a collar (3) having notches (-4, 5) and shoulders (12, 1S) rigidly attached to the end of said shaft reverse from ltlt) that carrying said lever, a cataract (39) hav- I said teething (9n) 1 i n l i i h ing a piston (16), a shaft (3), means for trans mitting the motion of said piston to the latter shaft and vice versa, and a collar (9) having projections (6, 7) fixed on the latter shaft, said projections engagingin the notches (4, 5) of the former collar (3).

4. In devices for temporarily admitting, air into a fire-box, the combination of a doorframe (26), a shaft (2) provided at one end with a lever (17) mounted rcvolubly on the door-frame, said lever being formed as a counterweight and provided with a handle, a fire-door (1) rigidly attached to said shaft, a pawl (25) pivoted on said door-frame, a sector (19) provided with toothing (20) mounted on said shaft, said pawl being ada ted to on age in said toothing (20), said toot ing (20) eing bounded on the side facing the door-frame by slanting upwardly extending faces, a collar (3) having notches (4, 5) and shoulders (12, 13) rigidly attached to the end of said shaft reverse from that carrying said lever, a cataract (39) having a piston (16), a shaft (8), means for transmitting the motion of said piston to the latter shaft and vice versa, and a collar (9) having projections (6, 7) fixed on the latter shaft, said projections engaging in the notches (4, 5) of the former collar (3).

5. In devices for temporarily admitting air into a lire-box, the combination of a doorframe (26), a shaft (2) provided at one end with a lever (17) mounted on the doorframe, said lever being formed as a counterweight and provided with a handle, a firedoor (1) rigidly attacl'ied to said shaft, a pawl (25) pivoted on said door-frame, a sector (19) provided with toothing (20) mounted on said shaft, said pawl being adapted to engage in said toothing (20), said toothin (20) being bounded on the side facing t e door-frame by slanting upwardly extending faces, a collar (3) having notches (4, 5) and shoulders (12. 13) rigidly attachei'l to the end of said shaft reverse from that carrying said lever, a cataract (39) having a piston (16), a shaft (8), means for exercising a sucking action on and raising the piston (16), means for transmitting the motion of the piston to the latter shaft, and a collar (9) having projections (6, 7) fixed on the latter shaft, said projections engaging in the notches (4, 5) of the former collar (3).

6. 1n devices for ten'iporarily admitting air into a fire-box, the combinatioi'i of a doorframe (26), a shaft (2) provided at one end with a lever (17) mounted revolnbly on the door-frame, said lever being formed as a counterweight and provided with a handle, a fire-door (l) rigidly attached to said shaft, a pawl (25) pivoted on said door-frame, a sector (19) provided with toothing (20) mounted on said shaft, said pawl being adapted to engage in said toothing (20),

facing the door-frame by slanting upwardly extending faces, a collar (3) having notches (4, 5) and shoulders (12, 13) rigidly attached to the end of said shaft reverse from that carrying said lever, a cataract (39) having a piston (16), a shaft (8), said cataract (39) connected with a pipe (41)), an ejector (41) connected with the latter pipe and connected with a steam pipe (42), means for cutting off from the ejector the steam flowing to the same through the steam pipe (42), means for transmitting the motion of said iiston to the latter shaft and vice versa, an a: collar (9) having projections (6, 7) fixed on the latter shaft, said projections engaging in the notches (4, 5) of the former collar (3).

7. In devices for temporarily admitting air into a fire-box, the combination of a door frame (26), two pipes (27, 28) connected belowwith the atmosphere and o ening above through said door-frame into t 10 firebox, a shaft (2) provided at one end with a lever (17) mounted revolubly on the door-frame, a fire-door (1.) rigidly attached to said shaft, a pawl (25) pivoted on said door-frame, a sector (19) provided with toothing (20) mounted on said shaft, said pawl being adapted to engage in said toothing (20), a collar (3) having notches (4, 5) and. shoulders (12, 13) rigidly attached to the end of said shaft reverse from that carrying said lever, a cataract (39) having a piston (16), a shaft (8), means for transmitting the motion of said piston to the latter shaft and vice versa, and a collar (9) having projections (6, 7) fixed on the latter shaft, said projections engaging in the notches (4, 5) of the former collar (3).

8. In devices for temporarily admitting air into a fire-box, the combination of a doorframe (26), two pipes (27, 28) connected below with the atmos here and openin above through said (lOUF-lfiIIlG' into the fi re-box, means for closing said pipes from the atmosphere, a shaft (2) provided at one end with a lever (17) mounted revolubly on the doorframe, a fire-door (1) rigidly attached to said shaft, a pawl (25) pivoted on said doorframe, a sector (.19) provided with the tooth.- ing (20) mounted on said. shaft, said )awl being adapted to engage in said toot him (20), a collar (3) having notches (4, 5) an shoulders (1.2, 13) rigidly attached to the end of said shaft reverse from that carrying said lever, a cataract (39) having a piston (16), a shaft (3), means for transmitting the motion of said piston. to the latter shaft and vice versa, and a collar (9) having projections (6, 7) fixed on the latter shaft, said projections engaging in the notches (4, 5) of the former collar (3).

9. In devices for temporarily admitting air into a fire-box, the combination of a doorframe (26), two pipes (27, 28) having sieves (34, 35) at their lower ends connected below with the :ltlllOSpliQrO and opening above through said door-frmne into the tire-box, 1

means for closing said pipes from the atmos- Fhere, a shaft (2) provided at one end with it i ever (17) mounted revolnbly en the d0nrframe, :1 tire-door (1) rigidly attached to said shaft, it pawl (25) pivoted 0n senl doorl IELIHG, [L sector (19) {)rnvided with tootl'iing shaft reverse from that carrying said. lever, 2L

eetnimet (39) having it piston (:16), u shaft 15 (8), means for trsnismitting the motion of said piston to the latter shaft and vice verse, and it collar (0) havingprnjeetions (6, 7) fixed on the latter shaft, said projections engaging in the'notel-ies (4 5) of the former 20 collar (3).

In testimony whet-(mt, l :illix my signature in the presenee 01' two witnesses.

G USTA V DE (lrRA H l i.

Witnesses:

FRIEDRICH RoKAnn, WOLDEMAR HAUP'J. 

